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#1
04-22-2011, 11:08 PM
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Regency RC-600 UHF converter
I recently picked up this Regency UHF converter on ebay. I think it's nicer looking than some of the more common models.
The seller did an excellent job double boxing it. The last two converters I got off ebay arrived damaged    I recently discovered that the Riders TV service manuals include UHF tuners  I dug through them and found this listed under IDEA. Click to see the larger version.   According to 'batterymaker' - "Industrial Development Engineering Associates, Regency's earlier name--the plant's very near where I live. Same place where they made the infamous TR-1 transistor radio." The power transformer and big metal tuning drum make it heavier than I had expected. There's not much to go bad in these so I slowly powered it up to reform the electrolytic and fired it up. We do still have a few analog UHF transmissions in my area and I have used other vintage UHF converters successfully before. At first, I got nothing until I read the Riders more carefully and realized it outputs on VHF channel 10. All the others I've used were on channel 4 or 5.   Now, I got some fuzzy video but no sound. I tried it on another TV with the same results. Time to check the tubes. The 6BK7 tested OK, but I found a 6T4 in place of the 6AF4. It is a valid substitute and both tubes tested OK ,but I replaced them anyway. Bingo! It doesn't work as well as the Motorola Strata-tuner below it, but it's certainly watchable.  If nothing else, it makes for an interesting decoration 
Last edited by bandersen; 04-23-2011 at 11:18 PM. 
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#3
04-23-2011, 03:40 PM
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Very nice looking converter!
 But does it only have one tube? Or is there an IF stage as well. Also, what is behind the circular hole in the back... is that a BNC connector ? I can't quite make out the details on the schematic. thanks! jr
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#4
04-23-2011, 05:18 PM
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Thanks. There are two tubes - a 6BK7 for the IF stage and a 6AF4 for the oscillator. It's hiding inside the drum.
You can click on the schematic to get a larger version. That thing in the back appears to be a tunable coil for the output frequency. 
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Linear Mode
